Weeds in North America are often exotics introduced to the continent from Europe, Asia, Africa, or South America into an ecosystem that offers little competition or predation. Some exotic plants become formidable problems, such as the invasive kudzu in the Southeastern United States, which strangles and shades native species, and causes economic damage to power lines, transformers, and telephone cables. Others, like the small herbaceous plant illustrated here, is found throughout the City of Tallahassee, Florida, but because of its low growing habit and nature of occupying disturbed edge areas near sidewalks and pathways, suffers from benign neglect.

The lavender petals of the flower illustrate the radial symmetry typical of many angiosperm species. Blue or lavender pigments are created to attract insect pollinators. Typically, a flower that is pink, blue or yellow, with a narrow opening or tube, as this flower exhibits, invites pollination by butterflies, while other flowers featuring bilateral symmetry are visited by bees. The color attributed to the petal is that perceived by the human visual system, but the same flower may appear to a honeybee, butterfly, beetle, or hummingbird as a bulls-eye pattern in various shades of ultraviolet. The shape of the flower, its aroma, the season of inflorescence, and the quality and quantity of its nectar or pollen also help ensure that the type of pollinator attracted will be most favorable to the success of the flowering plant's genes.